131531249 has 2 divisors, whose sum is σ = 131531250. Its totient is φ = 131531248.

The previous prime is 131531221. The next prime is 131531299. The reversal of 131531249 is 942135131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103388224 + 28143025 = 10168^2 + 5305^2 .

It is a cyclic number.

It is not a de Polignac number, because 131531249 - 2²⁰ = 130482673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131531299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65765624 + 65765625.

It is an arithmetic number, because the mean of its divisors is an integer number (65765625).

Almost surely, 2^131531249 is an apocalyptic number.

It is an amenable number.

131531249 is a deficient number, since it is larger than the sum of its proper divisors (1).

131531249 is an equidigital number, since it uses as much as digits as its factorization.

131531249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 29.

The square root of 131531249 is about 11468.7073813922. The cubic root of 131531249 is about 508.5609168409.

The spelling of 131531249 in words is "one hundred thirty-one million, five hundred thirty-one thousand, two hundred forty-nine".